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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Quasi Similar Routes of NO2 and NO Sensing by Nanocrystalline WO3: Evidence by In Situ DRIFT Spectroscopy
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Quasi Similar Routes of NO2 and NO Sensing by Nanocrystalline WO3: Evidence by In Situ DRIFT Spectroscopy

机译：纳米WO3感测NO2和NO的拟相似路径：原位DRIFT光谱的证据

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摘要

Tungsten oxide is a renowned material for resistive type gas sensors with high sensitivity to nitrogen oxides. Most studies have been focused on sensing applications of WO3 for the detection of NO2 and a sensing mechanism has been established. However, less is known about NO sensing routes. There is disagreement on whether NO is detected as an oxidizing or reducing gas, due to the ambivalent redox behavior of nitric oxide. In this work, nanocrystalline WO3 with different particle size was synthesized by aqueous deposition of tungstic acid and heat treatment. A high sensitivity to NO2 and NO and low cross-sensitivities to interfering gases were established by DC-resistance measurements of WO3 sensors. Both nitrogen oxides were detected as the oxidizing gases. Sensor signals increased with the decrease of WO3 particle size and had similar dependence on temperature and humidity. By means of in situ infrared (DRIFT) spectroscopy similar interaction routes of NO2 and NO with the surface of tungsten oxide were unveiled. Analysis of the effect of reaction conditions on sensor signals and infrared spectra led to the conclusion that the interaction of WO3 surface with NO was independent of gas-phase oxidation to NO2.
机译：氧化钨是电阻式气体传感器的知名材料，对氮氧化物具有高灵敏度。大多数研究都集中在WO3用于NO2检测的传感应用中，并且已经建立了传感机制。然而，对NO感测路线知之甚少。由于一氧化氮的矛盾氧化还原行为，在是否将NO检测为氧化性气体或还原性气体方面存在分歧。在这项工作中，通过钨酸的水相沉积和热处理合成了具有不同粒径的纳米晶WO3。通过WO3传感器的直流电阻测量，建立了对NO2和NO的高灵敏度以及对干扰气体的低交叉灵敏度。两种氮氧化物都被检测为氧化气体。传感器信号随WO3粒径的减小而增加，并且对温度和湿度的依赖性相似。借助原位红外（DRIFT）光谱，揭示了NO2和NO与氧化钨表面的相似相互作用路线。分析反应条件对传感器信号和红外光谱的影响，得出结论：WO3表面与NO的相互作用与气相氧化成NO2无关。

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